916398649 has 4 divisors (see below), whose sum is σ = 916756560. Its totient is φ = 916040740.

The previous prime is 916398631. The next prime is 916398661. The reversal of 916398649 is 946893619.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 946893619 = 7 ⋅135270517.

It is a cyclic number.

It is not a de Polignac number, because 916398649 - 2⁹ = 916398137 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 916398649.

It is not an unprimeable number, because it can be changed into a prime (916398629) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 175087 + ... + 180244.

It is an arithmetic number, because the mean of its divisors is an integer number (229189140).

Almost surely, 2^916398649 is an apocalyptic number.

It is an amenable number.

916398649 is a deficient number, since it is larger than the sum of its proper divisors (357911).

916398649 is a wasteful number, since it uses less digits than its factorization.

916398649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357910.

The product of its digits is 2519424, while the sum is 55.

The square root of 916398649 is about 30272.0770513026. The cubic root of 916398649 is about 971.3180964817.

The spelling of 916398649 in words is "nine hundred sixteen million, three hundred ninety-eight thousand, six hundred forty-nine".